Waterproof assembly for a blower

ABSTRACT

A waterproof assembly is provided to an air blower and has a cap adapted to be securely mounted on top of the circuit board and a primary seal is adapted to be sandwiched between the motor casing and the circuit board. A through hole is adapted to be defined through a periphery of the motor casing and a tube is extendable into the through hole to allow extension of control wires. A secondary seal is sandwiched between the tube and the periphery defining the through hole and a frame is adapted to be formed on the periphery defining the through hole of the motor casing and has a step to support the primary seal. The circuit board is mounted on top of the frame to sandwich the primary seal.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a waterproof assembly, and more particularly to a waterproof assembly for a blower so as to protect the blower from damage caused by humidity.

2. Description of the Prior Art

A blower installed outside the house is generally aimed at providing air to an object so as to inflate the object or a furnace to boost the heating efficiency. However, due to the humidity, the conventional blower is easily malfunctioned. The humidity in the air is considered to be the primary factor to affect the life span of an air blower. If the humidity problem is not properly dealt with, works that require the assistance of the air blower can not be done and the operator may suffer from potential fire caused by malfunctioned air blower. In order to prevent the air blower from being damaged by humidity, some operators move the air blower indoors or build a shelter for the air blower. Moving the air blower inside the room does temporarily solve the problem of infiltration by water into the air blower. However, the noise caused by the operation of the air blower pollutes the environments and endangers the operators' health due to the noise.

To overcome the shortcomings, the present invention tends to provide an improved waterproof assembly to mitigate the aforementioned problems.

SUMMARY OF THE INVENTION

The primary objective of the present invention is to provide an improved waterproof assembly for an air blower. The waterproof assembly of the present invention includes a frame adapted to be formed on a motor casing and having a through hole in communication with an interior of the motor casing, a primary seal is rested on a step of the frame, a secondary seal is supported by a face defining the through hole of the motor casing, a tube extending into the interior of the motor casing and having two extensions respectively extending in two opposed directions to sandwich the secondary seal with the face defining the through hole, a circuit board mounted on top of the frame to sandwich the primary seal with the step of the frame and a waterproof cover mounted on top of the circuit board to cover circuits on the circuit board.

The technique used in the present invention is that a cap is adapted to be securely mounted on top of the circuit board and a primary seal is adapted to be sandwiched between the motor casing and the circuit board.

A further technique used in the present invention is that a through hole is adapted to be defined through a periphery of the motor casing and a tube is extendable into the through hole.

Still a further technique used in the present invention is that a secondary seal is sandwiched between the tube and the periphery defining the through hole.

Another technique used in the present invention is that a frame is adapted to be formed on the periphery defining the through hole of the motor casing and has a step to support the primary seal. The circuit board is mounted on top of the frame to sandwich the primary seal.

Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded perspective view of an air blower of the present invention;

FIG. 2 is an enlarged perspective view of the waterproof assembly of the present invention;

FIG. 3 is a partial exploded perspective view of the waterproof assembly showing that the tube is assembled with the motor casing;

FIG. 4 is a partial exploded perspective view showing that the circuit board is assembled on top of the frame;

FIG. 5 is a perspective view showing that the waterproof assembly is assembled; and

FIG. 6 is a cross sectional view showing the waterproof assembly prevents water from seeping into the motor casing.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

With reference to FIG. 1, it is noted that an air blower used in the market is generally composed of a motor casing (10), a motor (20) received in the motor casing (10), a blade (30) received in the motor casing (10) and operably connected to the motor (20) and a rear cover (40) connected to one side of the motor (10) to encase the motor (20) and the blade (30) to protect the motor (20) as well as the blade (30) from damage. The operation and the structural relationship among components are all conventional in the art. Thus the following focus lies on the structural relationship of the waterproof assembly to the air blower and effect that the waterproof assembly brings to the air blower.

With reference to FIG. 2, it is noted that the motor casing (10) of the air blower shown in FIG. 1 is hollow inside and has a through hole (11) defined through a periphery of the motor casing (10) to communicate with an interior of the motor casing (10), a frame (12) formed on the periphery defining the through hole (11) and having multiple securing holes (121) defined in the periphery defining the through hole (11) and enclosed by the frame (12) and positioning holes (122) defined in the periphery defining the through hole (11) and being outside the frame (12) and a tube (13) having a secondary seal (131), two extensions (132) respectively extending in a direction opposite to one another and a connection hole (133) defined in each of the extensions (132) to correspond to and align with the securing holes (121).

The two extensions (132) are formed on an outer periphery of a top portion of the tube (13) so that a bottom portion of the tube (13) is able to extend into the through hole (11) before the secondary seal (131) is placed around the periphery adjacent to the through hole (11). Thus the secondary seal (131) is sandwiched between the periphery of the motor casing (10) and the two extensions (132) of the tube (13).

With reference to FIG. 3, it is noted that the frame (12) further has a step (123) configured to support the primary seal (14). The circuit board (15) is provided with multiple contacting seats (151) and locking holes (152) formed on an outer periphery around the circuit board (15) to correspond to and align with the positioning holes (122) of the frame (12). Therefore, after the primary seal (14) is rested on the step (123) and the circuit board (15) is placed on top of the frame (12), locking elements such as countersunk bolts or the like are employed to securely engage the connection between the circuit board (15) and the frame (12), as shown in FIG. 4. In addition, screw holes (153) are defined in a portion of the circuit board (15).

It is to be noted that the circuit board (15) has multiple contacting seats (151) from which control wires (not shown) are extended to connect to the motor (20) (as shown in FIG. 1) and the power source to complete the entire circuitry. In order to protect the contacting seats (151) from damage caused by humidity, a cap (16) is provided and has multiple mating holes (161) formed around the cap (16) and multiple screw holes (153) are formed on the circuit board (15). After the mating holes (161) are aligned with the screw holes (153), locking elements such as countersunk bolts or the like are employed to securely engage the connection between the cap (16) and the circuit board (15).

With reference to FIGS. 5 and 6, it is noted that due to the provision of the primary seal (14) and the secondary seal (131), water is prevented from seeping into the motor casing (10) to cause damage to the electrical components inside the motor casing (10). Further, the cap (16) is able to prevent water from direct engagement with the contacting seats (152). Thus circuitry of the air blower is protected.

It is to be understood, however, that even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed. 

1. In an air blower comprising a motor casing and a circuit board, wherein the improvement comprises: a cap is adapted to be securely mounted on top of the circuit board and a primary seal is adapted to be sandwiched between the motor casing and the circuit board.
 2. The air blower as claimed in claim 1, wherein a through hole is adapted to be defined through a periphery of the motor casing and a tube is extendable into the through hole.
 3. The air blower as claimed in claim 2, wherein a secondary seal is sandwiched between the tube and the periphery defining the through hole.
 4. the air blower as claimed in claim 3, wherein a frame is adapted to be formed on the periphery defining the through hole of the motor casing and has a step to support the primary seal, the circuit board is mounted on top of the frame to sandwich the primary seal. 